Gliese 752: Difference between revisions
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== Gliese 752 B characteristics == |
== Gliese 752 B characteristics == |
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{{Main|VB 10}} |
{{Main|VB 10}} |
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'''Gliese 752''' was not known to be a binary star system until the discovery of ''Gliese 752 B'' by [[George Van Biesbroeck]] in 1944. He identified this star as ''[[VB 10]]'' in his catalog. This star is notable for its .08 solar mass, near the lower mass limit for a star.<ref name="Biesbroeck"/> |
'''Gliese 752''' was not known to be a binary star system until the discovery of ''Gliese 752 B'' (''Van Biesbroeck's Star'') by [[George Van Biesbroeck]] in 1944. He identified this star as ''[[VB 10]]'' in his catalog. This star is notable for its .08 solar mass, near the lower mass limit for a star.<ref name="Biesbroeck"/> |
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This star is also known for its very low luminosity, with an [[absolute magnitude]] of nearly 19, making it very difficult to detect even with a large telescope.<ref name="SIMBAD">{{cite web |
This star is also known for its very low luminosity, with an [[absolute magnitude]] of nearly 19, making it very difficult to detect even with a large telescope.<ref name="SIMBAD">{{cite web |
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Revision as of 11:30, 2 August 2009
 | It has been suggested that VB 10 and Talk:VB 10#Proposed merge be merged into this article. (Discuss) Proposed since July 2009. |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aquila |
| Gliese 752 A | |
| Right ascension | 19h 16m 55.257s[1] |
| Declination | +05° 10′ 08.05″[1] |
| Apparent magnitude (V) | 9.13[1] |
| Gliese 752 B | |
| Right ascension | 19h 16m 57.62s[2] |
| Declination | +05° 09′ 02.2″[2] |
| Apparent magnitude (V) | 17.30[2] |
| Characteristics | |
| Spectral type | M2.5[1] / M8V[2] |
| Apparent magnitude (B) | ~10.63[1] / ~19.42[2] |
| Apparent magnitude (V) | ~9.13[1] / ~17.30[2] |
| Apparent magnitude (R) | ~8.3[1] / ~15.6[2] |
| Apparent magnitude (J) | ~5.58[1] / 9.908 ±0.025[2] |
| Apparent magnitude (H) | ~4.93[1] / 9.226 ±0.026[2] |
| Apparent magnitude (K) | ~4.67[1] / 8.765 ±0.022[2] |
| Variable type | BY[3]/UV[4] |
| Astrometry | |
| Proper motion (μ) | RA: -614[2] mas/yr Dec.: -1368[2] mas/yr |
| Parallax (π) | 164.3[2] ± 3.5[2] mas |
| Distance | 18.72 ly (5.74[5] pc) |
| Absolute magnitude (MV) | 10.13[5]/18.7[6] |
| Details | |
| Mass | 0.46[5] / 0.075 ±.05[7] M☉ |
| Radius | 0.546[5] / ~.102[5] R☉ |
| Temperature | ~3240[5] / ~2600[5] K |
| Metallicity | ? / ~0[7] |
| Age | ? / ~1G[7] years |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Database references | |
| SIMBAD | data |
Gliese 752 is a binary star system about 19 light years away in the Aquila constellation.[5] This system consists of two M-type stars. The primary star is the magnitude 9 Gliese (GJ) 752 A. The secondary star is the magnitude 17 Gliese (GJ) 752 B. This stellar pair form a astrometric binary star system separated by about 74 arc seconds (~434 AU).[6]
Gliese 752 A characteristics
The primary star, also known as Wolf 1055, is identified as a BY Draconis type variable star and is subject to flare events.[3] This star is also known for its high proper motion of about 1 arc second a year.[1]
Gliese 752 B characteristics
Gliese 752 was not known to be a binary star system until the discovery of Gliese 752 B (Van Biesbroeck's Star) by George Van Biesbroeck in 1944. He identified this star as VB 10 in his catalog. This star is notable for its .08 solar mass, near the lower mass limit for a star.[6]
This star is also known for its very low luminosity, with an absolute magnitude of nearly 19, making it very difficult to detect even with a large telescope.[2] It is identified as UV Ceti type variable star and is also subject to flare events. [4]
In 2009 a unique planetary system was announced around this star.[7]
See also
References
- ^ a b c d e f g h i j k l "SIMBAD query result: V* V1428 Aql -- Flare Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-30.
- ^ a b c d e f g h i j k l m n o p "SIMBAD query result: V* V1298 Aql -- Flare Star". Centre de Données astronomiques de Strasbourg. Retrieved 2009-05-28.
- ^ a b "V1428 Aql". General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Retrieved 2009-06-06.
- ^ a b "V1298 Aql". General Catalogue of Variable Stars, Sternberg Astronomical Institute, Moscow, Russia. Retrieved 2009-05-28.
- ^ a b c d e f g h Linsky; et al. (1995). "Stellar Activity at the End of the Main Sequence: GHRS Observations of the M8 Ve Star VB 10" (PDF). The Astrophysical Journal. 455: 670–676. doi:10.1086/176614.
{{cite journal}}: Explicit use of et al. in:|author=(help); Unknown parameter|day=ignored (help); Unknown parameter|month=ignored (help) - ^ a b c van Biesbroeck, G. (1944). "The star of lowest known luminosity". The Astronomical Journal: 61–62. Bibcode:1944AJ.....51...61V. doi:10.1086/105801.
{{cite journal}}: Unknown parameter|month=ignored (help); Unknown parameter|vol=ignored (|volume=suggested) (help) - ^ a b c d Pravdo; et al. (2009). "An Ultracool Star's Candidate Planet" (PDF). Submitted to the Astrophysical Journal. Retrieved 2009-05-30.
{{cite journal}}: Explicit use of et al. in:|author=(help); Unknown parameter|month=ignored (help)arXiv:0906.0544 absrtact